The insurance company has a limit to what they will spend based on the contract they have with the insured.

A recent study showed that 80 people are moving to this city every single week, which will continue to increase housing demand.

There are multiple factors that go into determining rents and if there is limited data the rents will be off. 

Seeing as our house is pretty rural, our choices are limited.

Totally new world for me knowing there are properties off the market, wholesalers, and people that loan money just for this purpose, different from a bank, I have always thought we were doomed from finding a good deal as everything I found was already on the market...my little knowledge and limited believes got me trapped.

I saw two recent studies comparing rental costs to home ownership.  

Also, not looking for feedback about the value/necessity/negatives/ or need of doing a study.

Most will likely stick to the technical limit of Sept 2021 when it ceased being a primary residence, but some may be comfortable going by the address on the 2021 return and others may explore a partial exclusion, depending on the reasons for your move abroad.If you'd like to read up on the technical rules, the IRS publication 523 gets into more detail than most people would like to know, but it does have some helpful tables and examples for different scenarios.

If you stop growing it wide early (more real estate) and you start growing it deep instead (more equity) you are limited in your final outcome.

If you are convinced this is the guru you want to follow, pick up a cheap resale on amazon or ebay...read and study it cover to cover.